Internet photo geospatial positioning method based on street views

A positioning method and geospatial technology, applied in geographic information databases, electronic digital data processing, special data processing applications, etc., can solve problems such as the absence of crowdsourced photos, limited accuracy of photo retrieval and positioning, and the inability to obtain the absolute geographic location of photos to be queried, etc. problem, to achieve the effect of increasing usability and applicability

Inactive Publication Date: 2017-09-05
NANJING UNIV +1
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Due to the limited positioning accuracy of simple photo retrieval and crowdsourced photos without geographic tags, even if a relative 3D model

Method used

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  • Internet photo geospatial positioning method based on street views
  • Internet photo geospatial positioning method based on street views
  • Internet photo geospatial positioning method based on street views

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Example Embodiment

[0045] The following describes the present invention in detail based on the drawings, which makes the technical route and operation steps of the present invention clearer.

[0046] In this embodiment, the Jianye District, one of the main urban areas of Nanjing, east of the Yangtze River, west of the Qinhuai River, is selected as the experimental area, such as figure 2 Shown. In 2014, the Youth Olympic Games was grandly held here. During the "Post Youth Olympics" period, Jianye District has undertaken the great mission of building a modern new Nanjing, and will develop into a new modern international city center. It is the most representative epitome of the development of Nanjing. Its street information is to a large extent It can reflect the streetscape of Nanjing. The downloaded street view data covers nearly 180 kilometers of urban roads, with a total of about 15,000 sampling points, and the street view photo library has a data volume of 120,000.

[0047] This embodiment takes...

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Abstract

The invention relates to an internet photo geospatial positioning method based on street views, comprising the steps of preprocessing a street photo gallery, extracting and describing features, and establishing a feature index; querying a nearest-neighbor feature of each feature of a photo to be queried, performing voting, trimming and smoothening voting results to obtain a most similar photo, using the most similar photo as a center of circle to delimit a buffer area according to a distance between two known street view points; calculating similarity of street photos in the buffer area to the photo to be queried so as to screen out photos of high similarity to form a similar photo set; subjecting both the similar photo set and the photo to be queried to feature extraction and matching, using an SfM (structure from motion) algorithm to register the photos, and generating a relative positional relationship between a sparse point cloud and a camera; calculating exterior orientation elements of the unknown photo to be queried according to the known street view point coordinates so as to finish positioning and orientating. Practice proves that the method provided herein enables electronic photos of any source on the internet to be positioned accurately.

Description

technical field [0001] The present invention relates to a photo geolocation method, in particular to an accurate photo geolocation method based on street view photos and adopting a three-step strategy of "image retrieval-matching identification-three-dimensional reconstruction". Background technique [0002] The street is the framework of the city, a vibrant urban space (Parthasarathi P, 2014). Life is inseparable from the streets, and the daily activities of citizens, such as commuting, shopping, entertainment and other travel for any purpose, rely on urban streets (Jacobs, 1993). With the popularization of electronic products (such as mobile phones), citizens record the details of their lives on the street with their mobile phones, and then upload them to the Internet as a record of life. In foreign countries, users upload a large number of photos to photo sharing sites such as Flickr and Panoramio. In China, users upload to social networking sites such as Weibo, Space, a...

Claims

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Application Information

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IPC IPC(8): G06F17/30
CPCG06F16/29G06F16/583G06F16/5866
Inventor 程亮袁一李满春楚森森孙越凡陈振杰魏晓燕李舒怡谌颂庄启智
Owner NANJING UNIV
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